Control knob



FIG. 1 is a perspective view of a control knob showing our new design, the broken line showing of the cover plate and insert is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a left side elevational view thereof;

FIG. 8 is a cross-sectional view thereof taken on line 8--8 of FIG. 2;

FIG. 9 is a top plan view of an alternate embodiment of the control knob, the bottom plan view being the same as FIG. 3;

FIG. 10 is a front or rear, left side or right side elevational view thereof;

FIG. 11 is a cross-sectional view thereof taken on line 11--11 of FIG. 9;

FIG. 12 is a top plan view of another alternate embodiment of the control knob;

FIG. 13 is a bottom plan view thereof; and,

FIG. 14 is a front or rear, right side or left side elevational view thereof; the cross sectional view is the same as FIG. 11. 

I claim the ornamental design for a control knob, substantially as shown and described. 